Confinement mechanism of FRP-confined concrete-encased cross-shaped steel columns

Huang, Le1,2; Yu, Tao1; Lin, Guan3; Zhang, Shi-Shun4

2023-02-01

10.1016/j.engstruct.2022.115349

ENGINEERING STRUCTURES   影响因子和分区

0141-0296

1873-7323

Fibre-reinforced polymer (FRP)-confined concrete-encased cross-shaped steel columns (FCCSCs) are an emerging type of hybrid columns. In an FCCSC, the concrete is subjected to combined confinement from the steel section and the FRP tube, leading to an enhanced load capacity and excellent ductility of the column. While several recent experimental studies have demonstrated the excellent structural performance of FCCSCs, the complex confinement mechanism behind their structural behaviour has not been clarified or thoroughly examined. This paper presents a comprehensive study aiming to investigate the confinement mechanism of FCCSCs. In this paper, the experimental observations of FCCSCs are first summarized, followed by three-dimensional FE modelling of the columns. The FE models, after being verified against the test results in various aspects, are used for a systematic parametric study. In this study, the complex interaction between the three components of FCCSCs (i.e., FRP tube, steel section and concrete) is illustrated explicitly and the effects of key parameters (i.e., flange width, flange thickness, web thickness and FRP tube thickness) are examined separately and thoroughly, leading to an in-depth understanding of the confinement mechanism of FCCSCs. In particular, through the ex-amination on the distribution of steel flange-to-concrete normal pressure, it is shown quantitatively that the variations of the dimensions of the steel section in a practically wide range have only marginal effects on its confinement to the concrete, while the increase of FRP tube thickness tends to reduce the confinement effect from the steel section.

FRP Cross-shaped steel section Concrete Column Finite element modelling Confinement mechanism

SCI ; EI

英语

其他

Australian Research Council[DP170102992] ; Hong Kong Research Grants Council[15222321]

Engineering

Engineering, Civil

WOS:000902049300005

ELSEVIER SCI LTD

20225013228343

Columns (structural) ; Fiber reinforced plastics ; Finite element method ; Steel construction ; Steel fibers

Construction Methods:405.2 ; Structural Members and Shapes:408.2 ; Steel:545.3 ; Pipe Accessories:619.1.1 ; Fiber Products:819.4 ; Numerical Methods:921.6

ENGINEERING

Web of Science

1.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China
2.Univ Wollongong, Fac Engn & Informat Sci, Sch Civil Min & Environm Engn, Wollongong, Australia
3.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
4.Huazhong Univ Sci & Technol, Sch Civil & Hydraul Engn, Wuhan, Peoples R China

Huang, Le,Yu, Tao,Lin, Guan,et al. Confinement mechanism of FRP-confined concrete-encased cross-shaped steel columns[J]. ENGINEERING STRUCTURES,2023,276.

Huang, Le,Yu, Tao,Lin, Guan,&Zhang, Shi-Shun.(2023).Confinement mechanism of FRP-confined concrete-encased cross-shaped steel columns.ENGINEERING STRUCTURES,276.

Huang, Le,et al."Confinement mechanism of FRP-confined concrete-encased cross-shaped steel columns".ENGINEERING STRUCTURES 276(2023).